Abstract: The stability of 5,10,15-tris(pentafluorophenyl)Corrole (tpfc) manganese(V)-Oxo corrole in different solvents and in the presence of axial ligand were investigated. The results show ethanol, octanol, ethyl ether, tetrahydrofuran, dimethyl sulfoxide and toluene can accelerate (tpfc) MnV≡O decay by using dichloromethane as reference, and N'N-dimethyl formamide, water, ethyl acetate, acetone can slow down (tpfc)MnV≡O decay. (tpfc)MnIV-Cl, (tpfc)MnIV-O2CCH3 were produced by the reaction of (tpfc)MnV≡O and hydrochloric acid and acetic acid. The axial coordination of (tpfc) MnIII by imidazole, 4-methylimidazole, pyridine give complexes with molar ratio of 1:1. The association constants follow an order of Imidazole >4-Methylimidazole >Py. In the presence of these axial ligands, the stability of (tpfc)MnV≡ O decreased significantly. The MnIII/MnIV half-wave potential of (tpfc) MnIII moved negatively upon combination with axial ligand. XPS results showed that the binding energy of center manganese Mn2p3/2 decreased after axial coordination by the ligand, and the reduction degree depends on the electron-donor capacity of axial ligand.

Key words: Corrole, Manganese-Oxo, Stability, Axial ligand